@misc{Birkenmajer_Aleksander_Prądy,
 author={Birkenmajer, Aleksander},
 howpublished={online},
 publisher={Birkenmajer, Aleksander},
 language={pol},
 type={odbitka},
 title={Prądy umysłowe XII i XIII stulecia},
 keywords={filozofia, nauka, 12w./13w.},
}